Thumbhole firearm grip



FIG. 1 is a front side view of the thumbhole firearm grip, embodying the new design;

FIG. 2 is a side view of the thumbhole firearm grip;

FIG. 3 is the top right side angle view thereof;

FIG. 4 is the top view thereof;

FIG. 5 is the bottom view thereof;

FIG. 6 is the front view thereof; and,

FIG. 7 is the back view thereof.

The broken lines in FIG. 1 are environment to only and form no part of the claimed design. 

CLAIM The ornamental design for a thumbhole firearm grip, as shown and described. 